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Question

Let A and B be two sets in the same universal set. Then A - B is a null set if

A
A and B are disjoint sets
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B
A is contained in B
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C
B is contained in A
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D
A and B are both Null Sets
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Solution

The correct options are
B A is contained in B
D A and B are both Null Sets
If A is contained in B then A - B is a null set because all the elements of set A belongs to set B.

If A and B are null sets, then A - B is also a null set.

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